HSP Cold Side Tube to HSP Bridge for 2004.5-2005 Chevrolet / GMC Duramax LLY

The LLY Duramax is known for its restrictive factory charge air system. After recognizing the potential power losses caused by the undersized OEM tubes, HSP upgraded the tubing to a 3" diameter. The results were clear: major performance gains across the board. Our dyno testing showed significant horsepower and torque improvements from this often-overlooked upgrade.

This Cold Side Tube delivers up to 53% more airflow compared to the stock unit. While actual performance gains may vary depending on tuning, turbo, and fuel system setups, one thing is certain — your airflow is only as strong as your weakest link. This is why pairing this tube with an HSP Bridge is essential to maximizing the full potential of your charge air system.

This version includes a 3" boot specifically designed to pair with an HSP Factory Replacement Bridge for LLY applications.

Included Components

1x Coldside Tube (HSP-IN-213)
2x 3" T-Bolt Clamp (RFB-422-RFAB)
1x 3"x4" Straight Boot (RFB-430-RFAB)

Benefits

Increased performance and turbo spool-up
Mandrel-bent tubing for precision fitment and optimal efficiency
High-strength, 5-layer silicone boot for improved durability
Powder coat finish options to enhance engine bay aesthetics

Compatibility

LLY: 2004.5-2005 (VIN Code 2)

How to identify VIN Code: The 8th character of the VIN indicates the engine code. The 10th character represents the model year.

Our Warranty

HSP NO BS LIMITED LIFETIME WARRANTY

At HSP, we stand behind every product we manufacture. For years, weve gone above and beyond for our customers without a formal warranty process. Now, we've raised the bar with our official “No BS” Limited Lifetime Warranty. Its straightforward, transparent, and built around our commitment to customer satisfaction.

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